Hydraulic throttle actuator



July 5, 1932.v A c. E FURGASON 1,865,561

HYDRAULIC THROTTLE ACTUATOR Filed' June 10, 1929 2 Sheets-Sheet l VlIlIIII/II/ill INVENTOR CZddaZe Z7 50 as;

R, BY

ATT O RN EYS' mama/A JU1Y 5, 1932. c E 'u so 1,865,561

HYDRAULIC THROTTLE ACTUATOR Filed June 10, 1929 2 Sheets-Sheet 2 INVENTOR czaudzlffayasm ATTORN EYS Patented July 5, 1932 UNITED STATES PATENT OFFICE.

CLAUDE E. FUBGASON, OF LANSING, MICHIGAN, ASSIGNOR TO REO MOTOR GAR COI- I'ANY, Oil? LANSING, MICHIGAN, A CORPORATION OF MICHIGAN v HYDRAULIC THROTTLE ACTUATOR Application filed June 10, 1929. Serial No. 369,907.

This invention relates to hydraulic throttle or accelerator actuating mechanism. 1

The invention has as one of its importan objects to improve the construction of the 5 master cylinder of the apparatus, or in other words, they portion of the device to which the lever or foot pedal is connected. To this end the invention contemplates the provision of means whereby the escape of fluid around the shaft or plunger may be prevented, this means comprising sealing washers independently compressible and so arranged that when compressed they will not bind or otherwise impede the reciprocation of the plunger.

The several objects, advantages and novel details of construction of the invention will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings wherein Figure 1 is a fragmentary elevational view, partly broken away, of a portion of a motor vehicle with my improved invention associated therewith; and

' Figure 2 is an enlarged vertical sectional view through the device, certain parts being broken away.

Referring now more particularly -to the drawings wherein like reference characters indicate like parts, it will be noted that there is illustrated an internal combustion engine 10 having a carburetor 11 and a combustible mixture conduit 12. Located within the conduit 12 is a throttle Valve (not shown), the shaft 13 of which extends exteriorly thereof.

The toe board ,of the vehicle is indicated by reference character 14, and 15 indicates a hydraulic medium container which may conveniently be, and preferably is, the fluid containing part of a hydraulic braking system.

Secured preferably to the engine block 10 is a cylinder 16 and secured adjacent the toe board of the vehicle is a cylinder .17. These cylinders are connected by a conduit 18, so that when fluid is forced from the cylinder 17 it may pass through conduit'18 and into the cylinder 16 to actuate the throttle in a manner to be later .referred to. 50 With a hydraulically actuated throttle or accelerator the use of rods and levers for connecting the accelerator pedal to the throttle valve may be eliminated and the tubing 18 may be run from the toe board to the carburetor in such a manner that it will be inconsplcuous and will not interfer with access to the engine. For instance, as suggested in Figure 1, the conduit 18 may extend through levers; provides more space for other neces-' sary parts or levers; and otherwise simplifies and improves the construction and assembling of the power plants of motor vehicles.

Reciprocally mounted in the cylinder 16 is a plunger 19. one end of which passes through an apertured plug 20 to the exterior of the cylinder. The end of this plunger is piv-,

otally connected as at 21 to a link 22 pivotally connected as at 23 to a lever 24. the

end of which, is in turn fixed to the shaft 13 of the throttle valve previously referred to. Thus reciprocation of the plunger 16 actuates the throttle valve. as will be obvious. The opposite end of the cylinder 16 is closed by a plug-like member 25 by means of which the adjacent end of the conduit 18 is connected thereto. The reference character 26 indicates abracketby means of which attachment is made to a suitable support. such for instance as the engine block. The reference character '27 indicates a bleeder aperture controlled by a ball check valve 28. Asprin g 29 bears against the ball and a set screw 30 threadedly. engages a portion of the cylinder 16. At the outset the set screw 30 is backed out so that the ball may be lifted from engagement with the seat by pressure from within the cylinder 16 and in this manner all of the air may be exhausted from the system. and when this has occurred, the set screw 30 is screwed home so as to hold the seat valve 26 to itsseat to prevent the passage through the aperture 27 of the fluid in the system.

The cylinder 17 is provided with an outlet opening 31 and an inlet opening 32, the

face of the adjustable bushing 36 is a lock nut 37 so the adjustable bushing 36 may be adjusted and secured in its adjusted position by means of the lock nut. Interposed between bushing 34 and bushing 36 is a sealing member 38 in the form of an annular ring or washer of packing material. The portion of the cylinder in which the sealing member 38 is located is smaller in diameter than that in which the bushings 34 and are located and the difference in these diameters provides an annular shoulder 39. The end of bushing 34 rests against this annular shoulder 39. The bushing 34 is provided with annular recesses 40 and radial apertures 41, establishing connection with the inlet aperture 32. The bushing 35 is provided with an "annular groove or recess 42 and with axial apertures 43. Threaded into the other end of the cylinder-17 is a cup-like member 44 providing a chamber 45. The end 46 of this cup-like member engages the adjacent end .of the bushing 35.

The end of plunger 33 is formed with an annular collar 47 against which one end of a spring 48 engages, the other end of this spring being seated in the end of the cup-like member 44. This spring normally holds the plunger 33 in the position illustrated in Figure 2.

The lower end ofplunger 33 is formed with an axial recess or bore 49. This bore is open at the lower end of the plunger and communicates at its other end by means of radial apertures 50 with the grooves and apertures 40 and 41, and as a consequence, with the inlet opening 32 of the cylinder. Located be; tween bushings 34 and 35 is another sealing member 51 in the form of an annularring or Washer of packing material. This sealing member constitutes a valve member for 010s ing the apertures 50 when the plunger 33 has been slightly depressed.

In operation a depression of plunger 33 moves the apertures 50 out of register with the inlet opening 32 and opposite the sealing member 51. The movement of this plunger displaces the fluid below the end of the plunger and forces this fluid through the apertures 43 and groove 42, through outlet opening 31 and thence through conduit 18 to cylinder 16, arranged adjacent the'throttle valve.. This actuates the plunger 19 in themanner previously referred to and as a consequence actuates the throttle valve. If there has been any loss of fluid in the system, this is automatically replenished upon the return stroke, because the return of the plunger 33 under the action of spring 48 will create a slight vacuum in the space between the plungers, and thus when apertures 50 again come into communication with inlet opening 32, the suction will draw additional fluid upwardly from the container 15 to replenish the supply in the system.

By adjusting the adjustable bushing 36, the packing or sealing member 38 may be compressed to seal the plunger 33 at this point and prevent the entrance of the air into the system and also the escape of any fluid past the plunger. The bushing 34 has a press fit with the cylinder and thus provides an abutment against which the sealing member 38 may be compressed. Bushing 35 has a slip fit and by adjusting the cap member 44 this bushing may be urged against the sealing member 51 to thus properly seal the plunger at this point. The extent of the adjustment of cap 44 is regulated by means of shims 52 interposed between a shoulder 53 on the cap and the end of the cylinder. By varying the thickness or number of the shims to be employed, the extent to which the sealing memher is compressed may be controlled.

By providing independent adjustment for the two sealing members, no difiiculty is experienced in properly sealing the plunger, and at the same time the easy reciprocation of the plunger is not interfered with. If it were attempted to adjust or compress both of the sealing members 38 and 51 by an adjustable member at one end, difiiculty is experienced because the sealing member nearer the adjustable member becomes too readily compressed and as a consequence binds upon the plunger.

Obvious changes in the specific details illustrated will suggest themselves to those skilled in this art and to this end reservation is made to make such changes in the illus trated details of construction as may come within the purview of the accompanying claims.

What I claim as my invention is:

1. In a hydraulic throttle actuating mechanism, a fluid containing cylinder, a pair, of bushings in said cylinder, a plunger in said cylinder reciprocally supported by said bushings and adapted to displace the fluid in ,said cylinder, one of said bushings having a press fit with said cylinder, sealing members surrounding said plunger and located at both ends of said last mentioned bushing, means threaded into said cylinder for compressing one of said sealing members against said last named bushing and means threaded into the other end of the cylinder and acting upon the other bushing for compressing said sealing giember against the bushing having the press 2. In a hydraulic throttle actuating mechanism of the character described, a fluid containing cylinder, longitudinall spaced bushings in said cylinder, onewhich has a sliding fit, a plunger reciprocally supported by said bushings and adapted to displace the fluid in sald cylinder, a sealing member between said bushings and surrounding said plunger, a member adjustably secured to the end of said cylinderand provided with an extension engaging said last mentioned bushing whereby said sealing member may be compressed by adjusting said adjustable member and shims insertable between said adjustable member and said cylinder for regulatin the extent of the movement of said adjusta 1e member.

In testimony whereof I aflix my si ature.

CLAUDE E. FUR ASON. 

